Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Self-oscillation"”.
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Material, acoustic, and mechanical properties of mosquito and midge antennae
… arabiensis and An. gambiae demonstrated strong self-oscillation with high Q-factors. Unlike the mosquitoes, vibrometry of C. riparius showed no relevant self-oscillation of the antenna. Female T. brevipalpis produced self-oscillation but weaker than the male. The three-dimensional pattern of …
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Improvements in Inductively Coupled Wireless Power Transfer Through Non-Sinusoidal Excitation and Closed-Loop Operation Using Optical Feedback
… can be further configured as a system in self-oscillation which allows the system to naturally operate at the best driving frequency and respond rapidly to any changes in the coupling parameters or charging conditions without external assistance. Despite the threshold voltage of the LED is …
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Soft matter in motion: from actin to active emulsions
… was tracked and we studied the mechanism of this self-oscillation. On a smaller scale, communication could be observed among individual droplets using polarized light microscopy. Lastly, we studied the photosensitivity of an azobenzene-funcationalized triblock copolymer with a customized …
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Ultra-sensitive Mid-infrared Detection Using Phononic Crystal Resonator-based Oscillator
… product into a low-noise self-oscillation system, my MIR detector achieves high sensitivity on the order of hundreds of picowatts. The SAW architecture also provides significantly higher thermal conductance than suspended thin-film structures, enabling fast thermal …
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Spatiotemporal behavior and nonlinear dynamics in a phase conjugate resonator
… medium were derived and used to determine the self-oscillation conditions. The solutions, through simple frequency domain transformation techniques, were used to define the PCR's transfer function and analyse its stability. Taking into account pump depletion and medium absorption, the transient …
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Electron Energy Loss Spectroscopy and Optical Properties of Plasmonic Nanostructure
Plasmon is considered to be the incompressible self-oscillation of conducting electrons in small nanoparticles. A classical spring model could be used to describe plasmon’s behavior. Many different techniques have been applied to understand nanostructure’s plasmonic properties. Electron energy loss …
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Experiments and Simulations of Autonomous Microscale Robotics
… collective intelligence in the form of emergent self-oscillation, among a group of simple, unassuming microparticles. I studied the counter-intuitive order arising from intentional breakage of the collective’s symmetry, and harnessed the stable periodic mechanical motion for the generation of …
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Properties and Behaviours of Fuzzy Cellular Automata
… property in their fuzzy form which we call self-oscillation. We then give a probabilistic interpretation of fuzzy cellular automata and show that homogeneous asymptotic states are equivalent to mean field approximations of Boolean cellular automata. We then turn our attention the asymptotic …
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Iterative image processing using a cavity with a phase-conjugate mirror: possibilities and limitations
… a PCM cavity can be substantially influenced by self-oscillations of the cavity above threshold. This was experimentally studied by observing the time evolution of the input. To avoid the influence of self-oscillation, the cavity must be operated below threshold. It is found that the cavity decay …
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Advanced High-Frequency Electronic Ballasting Techniques for Gas Discharge Lamps
… ballasts with lamp voltage feedback, and self-oscillating single-stage PFC electronic ballasts. Single-stage boost-derived PFC electronic ballasts with voltage-divider-rectifier front ends are developed to solve the problem imposed by the high boost conversion ratio required by commonly …
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Self-Oscillating Unified Linearizing Modulator
… on the input voltage. In the thesis work, a self-oscillating unified linearizing modulator is introduced. It first provides a unified procedure to establish a large-signal control-to-output linearity for different pulse-width modulation dc-dc converters. Feedforward is employed to mitigate …
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High Frequency Thermally Actuated Single Crystalline Silicon Micromechanical Resonators with Piezoresistive Readout
… losses. Therefore, such resonators can provide self-Q-enhancement and self-sustained-oscillation without the need for any electronic circuitry. In this research these facts have been shown both experimentally and theoretically. In addition, in order to further simplify the fabrication process of …
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Enhancing the performance of a self-oscillating fluidic heat engine (SOFHE) through thermodynamic cycle and phase change characterization
… bulle de vapeur-bouchon liquide est mise en oscillation par une évaporation-condensation cyclique d'une film liquide mince formée par une fibre de mèche. La première démonstration expérimentale du SOFHE a montré une faible puissance électrique de 1 µW. Cependant, on ne savait toujours pas …